The stack offsets of cache slots are always positive, but the compiler
does not know that. The lack of this knowledge makes division by the
system pointer size significantly more expensive.

One solution would be to rewrite the division to be an actual right
shift. Another solution is to teach the compiler that offsets are
positive. This CL does the latter.

This reduces the overall Liftoff compile time of the reproducer in the
linked issue by nearly 25%.

R=jkummerow@chromium.org, cbruni@chromium.org

Bug: v8:13063
Change-Id: Ib55b35d407e9909c792ae095a6767aaa03faebdc
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3760453Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Cr-Commit-Position: refs/heads/main@{#81778}